CN113315198A - Can replace lithium battery device that lead acid battery used - Google Patents

Can replace lithium battery device that lead acid battery used Download PDF

Info

Publication number
CN113315198A
CN113315198A CN202110581146.XA CN202110581146A CN113315198A CN 113315198 A CN113315198 A CN 113315198A CN 202110581146 A CN202110581146 A CN 202110581146A CN 113315198 A CN113315198 A CN 113315198A
Authority
CN
China
Prior art keywords
charging
discharging
lithium battery
contactor
direct current
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202110581146.XA
Other languages
Chinese (zh)
Inventor
彭建华
潘继雄
周幼华
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shenzhen Yujiaocheng Technology Co ltd
Original Assignee
Shenzhen Yujiaocheng Technology Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shenzhen Yujiaocheng Technology Co ltd filed Critical Shenzhen Yujiaocheng Technology Co ltd
Priority to CN202110581146.XA priority Critical patent/CN113315198A/en
Publication of CN113315198A publication Critical patent/CN113315198A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/18—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for batteries; for accumulators
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/00302—Overcharge protection
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/00304—Overcurrent protection
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/00306—Overdischarge protection
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/00308—Overvoltage protection
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/00309—Overheat or overtemperature protection
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/0031—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using battery or load disconnect circuits
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/0036—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using connection detecting circuits
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0042—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by the mechanical construction
    • H02J7/0045—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by the mechanical construction concerning the insertion or the connection of the batteries
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
    • H02J7/0048—Detection of remaining charge capacity or state of charge [SOC]
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
    • H02J7/005—Detection of state of health [SOH]
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0069—Charging or discharging for charge maintenance, battery initiation or rejuvenation
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
    • H02J7/00714—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery charging or discharging current
    • H02J7/00716—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery charging or discharging current in response to integrated charge or discharge current
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
    • H01M2010/4271—Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Abstract

The invention relates to the technical field of lithium batteries, and discloses a lithium battery device capable of replacing a lead-acid storage battery, wherein a control scheme of a direct current contactor and a power diode is adopted to replace a control scheme of a charge-discharge protection switch which commonly uses an MOS (metal oxide semiconductor) tube array in the existing battery protection board, and the problem of possible breakdown damage of a lithium battery pack in the series-parallel operation process is effectively solved by utilizing the outstanding advantage that the direct current contactor and the power diode can continuously bear high voltage and large current impact for a long time. Meanwhile, the lithium battery device capable of replacing the lead-acid storage battery provided by the invention can realize charging activation when the protection of the main discharging loop is disconnected, can realize discharging activation when the protection of the main charging loop is disconnected, realizes pure online switching seamless transition between discharging and charging, and has higher popularization and application values.

Description

Can replace lithium battery device that lead acid battery used
Technical Field
The invention relates to the technical field of lithium batteries, in particular to a lithium battery device capable of replacing a lead-acid storage battery.
Background
The lead-acid storage battery invented in 1859 has been developed for over 160 years since now, because of its advantages of low price, easily available raw materials, sufficient reliability in use and the like, it is widely used in various fields such as traffic, electric power, communication, military, navigation, aviation and the like. However, the exposed disadvantages of lead-acid batteries during use are also evident, such as low energy density, short service life, frequent routine maintenance, etc. With the recent development of the technology of lithium batteries, lithium batteries have been increasingly popular in the market and appreciated by users because of their advantages such as high energy density, long life, small size, light weight, and no pollution, as compared with lead-acid batteries, and have been greatly replaced in various fields.
Generally, the nominal voltage of a lead-acid storage battery cell is 2Vdc, the nominal voltage of a storage battery formed by connecting 6 cells in series is 12Vdc, a storage battery module with the nominal voltage of 12Vdc is most common in practical use, and battery packs with 24Vdc, 36Vdc, 48Vdc, 60Vdc and 72Vdc voltage platforms formed by connecting 2-6 storage battery modules with 12Vdc in series according to field application requirements are common to meet different use conditions. The capacity of the storage battery is usually measured by "Ah" (ampere-hour), "Ah" means that the storage battery can discharge for 1 hour (h) under the condition of 1 ampere (a), and in actual use, in order to improve the discharging capacity and the reserve capacity of the storage battery, a plurality of storage battery modules are connected in parallel to increase the value of "Ah".
The lead-acid storage battery can be widely used in various fields, and one important reason is that the lead-acid storage battery can be randomly connected in series and in parallel under the condition of the same specification to meet different application occasions, can be in a floating charge state for a long time, does not need a special electronic circuit management unit for charge and discharge protection, and is very flexible and convenient to use.
At present, the application fields of lithium batteries replacing lead-acid batteries are being developed vigorously: the lithium battery is different from a lead-acid storage battery, and needs to be matched with a Battery Management System (BMS) or a battery protection board to monitor the working process of the lithium battery in real time, so that the lithium battery is prevented from having faults such as overcharge, overdischarge, over-temperature, overcurrent or short circuit, in addition, the capacity of the lead-acid storage battery is measured by voltages at two ends of a positive pole and a negative pole, different voltage values correspond to different capacity values, but the corresponding relation of the voltage-capacity curve of the lithium battery is not obvious, and a specific algorithm needs to be adopted to calculate the residual electric quantity (SOC), such as a common ampere-hour integral method, an extended Kalman filter algorithm, a neural network algorithm and the like.
Taking a lead-acid storage battery with a nominal voltage of 12Vdc as an example, if a lithium battery is used for replacement, a lithium iron phosphate battery PACK is specifically adopted for grouping, and according to the rated voltage of 3.2Vdc of a single lithium iron phosphate battery, 4 lithium batteries are required to be connected in series to form the rated voltage of 12.8 Vdc. For the lithium iron phosphate battery pack with a rated voltage of 12.8Vdc, a battery protection board of an MOS transistor control scheme is generally adopted in the industry to perform voltage and temperature sampling and logic protection judgment on the lithium iron phosphate battery pack, and a specific electrical principle is shown in fig. 1, the battery protection board adopting the control principle can be realized by using a discrete device, or can be realized by using an Analog Front End (AFE) and a special protection IC, such as SEIKO (SEIKO), Richness (RICOH), FORTUNE (FORTUNE), capene (ape), beijing central star micro (VIMICRO), Stran (SILAN) in china and other brand enterprises having single-string and multi-string lithium battery protection ICs to market.
The electrical schematic diagram of the battery protection board shown in fig. 1 belongs to a charge-discharge same-port scheme, and VC 1-VC 4 are voltage sampling ends of 4 batteries VBAT 1-VBAT 4 respectively; r8 is a current sampling resistor on the main loop of the battery and is used for detecting the charge and discharge current of the loop; R1/C1, R2/C2, R3/C3, R4/C4, R5/C5, R6/C6 and R7/C7 are all RC low-pass filters which are used for filtering high-frequency noise and spike interference on a line; q1 is a discharge control MOS tube, Q2 is a charge control MOS tube, and D1 and D2 are internal parasitic diodes of Q1 and Q2 respectively. When the battery protection control core is normally used, the battery protection control core can drive the charging and discharging MOS tube to be in a conducting state, and the battery is normally charged and discharged; when the battery voltage is detected to be higher than the overcharge voltage threshold value in the charging process, the battery protection control kernel drives the charging MOS tube to be cut off, the charging loop is disconnected, and the charging is stopped; when the battery voltage is detected to be lower than the over-discharge voltage threshold value in the discharging process, the battery protection control kernel drives the discharging MOS tube to be cut off, the discharging loop is disconnected, and discharging is stopped. In the practical application process, the overcurrent capacity of the battery protection board needs to be matched with the capacity and the discharge rate of the battery, if the overcurrent capacity of the battery protection board needs to be improved, the overcurrent capacity is generally realized by parallel connection of MOS (metal oxide semiconductor) tubes to form an MOS tube parallel array, and theoretically, the stacking parallel connection of N MOS tubes is N times of the overcurrent capacity of a single MOS tube.
However, the battery protection board adopting the MOS transistor control scheme has a fatal defect when used with a lithium battery pack: it cannot be connected in series or in parallel as much as a lead-acid battery. When the lithium battery packs are connected in series, the direct-current withstand voltage borne by the two ends of the leakage source of the charge and discharge MOS (metal oxide semiconductor) tube can be obviously improved, the specific borne direct-current withstand voltage value is equal to the direct-current total voltage of all the series battery packs, and if the direct-current total voltage exceeds the limit leakage source withstand voltage (VDS (max)) of the MOS tube, the MOS tube can be broken down and damaged; when the lithium battery packs are in parallel operation, if pressure difference exists between the parallel lithium battery packs, large circulation current can be generated between the parallel lithium battery packs, namely, the high-voltage lithium battery pack charges the low-voltage lithium battery pack, the larger the pressure difference is, the larger the charging current is, and because of the individual discrete type existing among the parallel MOS tubes in the battery protection board due to process difference, the leakage source conduction resistances (RDS (on)) of the parallel MOS tubes are different, the large circulation current can not be evenly distributed, the current passing through the MOS tube with the smallest RDS (on) is the largest, the generated heat is the largest, and the parallel MOS tube is most easily damaged by thermal breakdown.
Disclosure of Invention
The invention mainly aims to provide a lithium battery device capable of replacing a lead-acid storage battery, and aims to solve the problem that a lithium battery pack is likely to be broken and damaged in the series-parallel operation process and enable the lead-acid storage battery to be replaced seamlessly.
In order to achieve the above object, the lithium battery device provided by the present invention comprises a lithium battery pack, a Battery Management System (BMS), a current divider, a discharging dc contactor, a charging dc contactor, a discharging transition diode, a charging/discharging interface P +, and a charging/discharging interface P-, wherein the lithium battery pack has a positive terminal B + and a negative terminal B-, the charging/discharging interface P + is electrically connected to the positive terminal B +, the charging/discharging interface P-is sequentially and serially connected to the charging dc contactor, the discharging dc contactor, the current divider, and the negative terminal B-, two ends of the discharging transition diode and the charging transition diode are respectively and electrically connected to two ends of the charging dc contactor and the discharging dc contactor in parallel, and the Battery Management System (BMS) is respectively connected to the lithium battery pack, the current divider, the charging transition diode, and the discharging dc contactor, The shunt, the discharging direct current contactor and the charging direct current contactor are electrically connected.
Further, the lithium battery pack comprises 4 lithium iron phosphate battery packs, and the 4 lithium iron phosphate battery packs are sequentially connected in series and electrically.
Further, the rated working voltage platform of the lithium battery pack is 12.8 Vdc.
Further, the charging direct current contactor and the discharging direct current contactor are high-voltage large-current protection switches, the charging direct current contactor and the discharging direct current contactor are equally divided into a coil control end and a load end, the coil control end is respectively electrically connected with the lithium battery pack, the load end is respectively electrically connected with a high-voltage large-current load, and the charging direct current contactor and the discharging direct current contactor are respectively used for disconnecting a charging main loop and a discharging main loop.
Further, the charging transition diode and the discharging transition diode are both power diodes.
By adopting the technical scheme of the invention, the invention has the following beneficial effects:
1. the invention provides a lithium battery device capable of replacing a lead-acid storage battery, which belongs to a charge-discharge same-port scheme and comprises a lithium battery pack, a Battery Management System (BMS), a current divider, a discharge direct current contactor, a charge direct current contactor, a discharge transition diode, a charge transition diode and the like;
2. the lithium battery device capable of replacing the lead-acid storage battery provided by the invention adopts a control scheme of a direct current contactor and a power diode to replace a control scheme of using an MOS (metal oxide semiconductor) tube as a charging and discharging protection switch in the existing battery protection board, and solves the problem of possible breakdown damage of a lithium battery pack in the series-parallel connection operation process by utilizing the outstanding advantage that the direct current contactor and the power diode can continuously bear high voltage and large current impact for a long time;
3. the invention provides a charging direct current contactor and a discharging direct current contactor adopted in a lithium battery device capable of replacing a lead-acid storage battery, belonging to a high-voltage heavy-current protection switch, which can be used for respectively disconnecting a charging main loop and a discharging main loop and comprising a coil control end and a load end, wherein the coil control end is directly provided with an operation power supply by a lithium battery pack, and the load end is used for cutting off a high-voltage heavy-current load;
4. the charging transition diode and the discharging transition diode adopted in the lithium battery device capable of replacing the lead-acid storage battery belong to power diodes, can bear high voltage and heavy current impact, can realize charging activation when the protection of the discharging main loop is disconnected, can realize discharging activation when the protection of the charging main loop is disconnected, and realizes pure online switching seamless transition between discharging and charging.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is an electrical schematic diagram of a battery protection board employing a MOS transistor control scheme;
FIG. 2 is a schematic diagram of a lithium battery pack according to the present invention, which can be used in place of a lead-acid battery;
fig. 3 is a software operation flowchart of the BMS control circuit according to the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
The invention provides a lithium battery device capable of replacing a lead-acid storage battery.
In one embodiment of the present invention, as shown in fig. 2 and 3, the lithium battery device for use in replacement of lead-acid battery comprises a lithium battery pack, a Battery Management System (BMS), a current divider, a discharging dc contactor, a charging dc contactor, a discharging transition diode, a charging/discharging interface P +, and a charging/discharging interface P-, wherein the lithium battery pack has a positive terminal B + and a negative terminal B +, the charging/discharging interface P + is electrically connected to the positive terminal B +, the charging/discharging interface P-is electrically connected to the charging dc contactor, the discharging dc contactor, the current divider, and the negative terminal B-, in series, two ends of the discharging transition diode and the charging transition diode are electrically connected to two ends of the charging dc contactor and the discharging dc contactor in parallel, respectively, and the Battery Management System (BMS) is respectively connected to the lithium battery pack, The shunt, the discharging direct current contactor and the charging direct current contactor are electrically connected.
Specifically, the lithium battery pack comprises 4 lithium iron phosphate battery packs, and the 4 lithium iron phosphate battery packs are sequentially connected in series and electrically.
Specifically, the rated working voltage platform of the lithium battery pack is 12.8 Vdc.
Specifically, the direct current contactor that charges and the direct current contactor that discharges are high-voltage heavy current protection switch, just the direct current contactor that charges and the direct current contactor that discharges equally divide and do not include coil control end and load end, the coil control end respectively with lithium cell group electricity is connected, the coil control end is direct to be organized by lithium cell and provides operating power, the load end is connected with high-voltage heavy current load electricity respectively, the load end is used for cutting off high-voltage heavy current load, the direct current contactor that charges and the direct current contactor that discharges are used for breaking off the major loop that charges and the major loop that discharges respectively.
Specifically, the charging transition diode and the discharging transition diode are both power diodes, can bear high voltage and large current impact, can realize charging activation when the discharging main circuit protection is disconnected, can realize discharging activation when the charging main circuit protection is disconnected, and realizes pure online switching seamless transition between discharging and charging.
Specifically, the Battery Management System (BMS) is powered by the lithium battery pack, and the main roles of the Battery Management System (BMS) are three points: firstly, sampling voltage and temperature information of each single battery in real time, secondly, performing data operation processing to perform core algorithm estimation such as battery residual capacity (SOC), health condition (SOH), power bearing capacity (SOP) and the like, thirdly, performing logic protection judgment, and controlling a charge and discharge protection switch according to battery state information to prevent the battery from generating faults such as overcharge, overdischarge, overtemperature, overcurrent or short circuit; the current divider is used for detecting charge and discharge current in a main circuit of the battery and converting a current signal into a voltage signal for sampling by the BMS; the charging direct current contactor and the discharging direct current contactor belong to high-voltage heavy-current protection switches, can be used for respectively disconnecting a charging main loop and a discharging main loop, and comprise coil control ends and load ends, wherein the coil control ends are directly provided with an operating power supply by the lithium battery pack, and the load ends are used for cutting off a high-voltage heavy-current load; the charging transition diode and the discharging transition diode belong to power diodes, can bear high voltage and heavy current impact, can realize charging activation when the protection of the discharging main loop is disconnected, can realize discharging activation when the protection of the charging main loop is disconnected, and realizes pure online switching seamless transition between discharging and charging.
Particularly, the battery protection board adopting the MOS transistor control scheme cannot be randomly connected in series and parallel like a lead-acid storage battery, and the main symptom is that the direct-current withstand voltage and the overcurrent capacity of the charge and discharge MOS transistor are too small to bear high-voltage and large-current impact. Therefore, compared with the prior art, the control circuit part of the invention thoroughly abandons the control scheme of the MOS tube, but adopts the control scheme of the DC contactor and the power diode for replacement, and solves the possible breakdown damage problem of the lithium battery pack in the series-parallel operation process by utilizing the outstanding advantage that the DC contactor and the power diode can continuously bear high voltage and large current impact for a long time.
The lithium battery device capable of replacing the lead-acid storage battery provided by the invention can be used independently, and can also be used in series and in parallel, so that the purposes of improving the working voltage platform and the discharge rate of the lithium battery device are achieved. The operation principle and process of the electrical topology structure diagram shown in fig. 2 and the BMS software control flow diagram shown in fig. 3 are described as follows:
(1) the method comprises the following steps that a Battery Management System (BMS) is subjected to power-on self-test, battery voltage, current and temperature information are collected in real time, if the battery state is normal, a charging direct current contactor and a discharging direct current contactor are controlled to be attracted, and a main circuit of the battery is unblocked;
(2) in the discharging process of the lithium battery pack, if protection thresholds such as over-discharge, over-temperature, over-current or short circuit of the battery are triggered, the BMS controls the discharging direct current contactor to be disconnected and cuts off a main discharging loop of the battery;
(3) under the condition that the lithium battery pack is in a discharge protection action, if a charging device is connected to the outside, the charging current is detected by the BMS through a charging device output positive electrode → P + → the lithium battery pack → the shunt → the charging transition diode → the charging direct current contactor → P- → the charging device output negative electrode, then the BMS is combined with the discharge protection state, the BMS immediately controls the discharging direct current contactor to attract, the charging transition diode is shielded, the charging current is controlled by the BMS through the charging device output positive electrode → P + → the lithium battery pack → the shunt → the discharging direct current contactor → the charging direct current contactor → P- → the charging device output negative electrode, the charging main loop returns to normal, and the heating loss of the charging transition diode caused by long-time large current passing is avoided;
(4) in the charging process of the lithium battery pack, if protection thresholds such as overcharge, over-temperature and overcurrent of the battery are triggered, the BMS controls the charging direct current contactor to be disconnected and cuts off a main charging loop of the battery;
(5) under the condition that the lithium battery pack is in a charge protection action, if a load device is externally connected, discharge current passes through a positive electrode of the lithium battery pack → P + → a positive electrode of the load device → a negative electrode of the load device → P- → a discharge transition diode → a discharge direct current contactor → a shunt → a negative electrode of the lithium battery pack, the BMS detects the discharge current at the moment and immediately controls the charge direct current contactor to attract in combination with the charge protection state of the discharge direct current, the discharge transition diode is shielded, the discharge current passes through the positive electrode of the lithium battery pack → P + → the positive electrode of the load device → the negative electrode of the load device → P- → the charge direct current contactor → the discharge direct current contactor → the shunt → the negative electrode of the lithium battery pack, and a discharge main circuit returns to normal, so that the discharge transition diode is prevented from generating heating loss due to long-time passing of large current;
(6) if a plurality of lithium battery packs are connected in series for use, the direct-current withstand voltage born by the charging and discharging direct-current contactor and the power diode is increased, and the BMSs protect the matched battery packs respectively and work independently without mutual influence; if a plurality of lithium cell group parallelly connected uses, high-pressure lithium cell group will charge to low pressure lithium cell group, and both pressure differentials are big more, will be big more to charging current, will bear great circulation to charging in the charge-discharge direct current contactor short time, and BMS protects supporting group battery separately, and the autonomous working does not each other influence.
Specifically, the invention provides a lithium battery device capable of replacing a lead-acid storage battery, aiming at the problem that the random series-parallel connection of the lead-acid storage battery cannot be realized after the conventional lithium battery pack replaces the lead-acid storage battery, the control scheme that an MOS (metal oxide semiconductor) tube array is commonly used as a charge-discharge protection switch in the conventional battery protection board is replaced by the control scheme that a direct-current contactor and a power diode are adopted, and the problem of possible breakdown damage of the lithium battery pack in the series-parallel connection operation process is effectively solved by utilizing the outstanding advantage that the direct-current contactor and the power diode can continuously bear high voltage and large current impact for a long time. Meanwhile, the lithium battery device capable of replacing the lead-acid storage battery provided by the invention can realize charging activation when the protection of the main discharging loop is disconnected, can realize discharging activation when the protection of the main charging loop is disconnected, realizes pure online switching seamless transition between discharging and charging, and has higher popularization and application values.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims (5)

1. The lithium battery device capable of replacing the lead-acid storage battery is characterized by comprising a lithium battery pack, a Battery Management System (BMS), a current divider, a discharging direct current contactor, a charging direct current contactor, a discharging transition diode, a charging and discharging interface P + and a charging and discharging interface P-, wherein the lithium battery pack is provided with an anode terminal B + and a cathode terminal B-, the charging and discharging interface P + is electrically connected with the anode terminal B +, the charging and discharging interface P-is sequentially and serially and electrically connected with the charging direct current contactor, the discharging direct current contactor, the current divider and the cathode terminal B-, two ends of the discharging transition diode and the charging transition diode are respectively and electrically connected with two ends of the charging direct current contactor and two ends of the discharging direct current contactor in parallel, and the Battery Management System (BMS) is respectively connected with the lithium battery pack, the discharging direct current contactor and the cathode terminal B-, The shunt, the discharging direct current contactor and the charging direct current contactor are electrically connected.
2. The lithium battery device capable of replacing a lead-acid battery for use according to claim 1, wherein the lithium battery pack comprises 4 lithium iron phosphate battery packs, and the 4 lithium iron phosphate battery packs are electrically connected in series in sequence.
3. The lithium battery pack for use in a replaceable lead-acid battery of claim 1, wherein the lithium battery pack has a nominal operating voltage platform of 12.8 Vdc.
4. The lithium battery device capable of replacing a lead-acid storage battery according to claim 1, wherein the charging dc contactor and the discharging dc contactor are high-voltage high-current protection switches, and each of the charging dc contactor and the discharging dc contactor respectively comprises a coil control terminal and a load terminal, the coil control terminal is respectively electrically connected to the lithium battery pack, the load terminal is respectively electrically connected to a high-voltage high-current load, and the charging dc contactor and the discharging dc contactor are respectively used for disconnecting a charging main loop and a discharging main loop.
5. The lithium battery device for use with a replaceable lead-acid battery of claim 1, wherein the charge transition diode and the discharge transition diode are both power diodes.
CN202110581146.XA 2021-05-26 2021-05-26 Can replace lithium battery device that lead acid battery used Pending CN113315198A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202110581146.XA CN113315198A (en) 2021-05-26 2021-05-26 Can replace lithium battery device that lead acid battery used

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202110581146.XA CN113315198A (en) 2021-05-26 2021-05-26 Can replace lithium battery device that lead acid battery used

Publications (1)

Publication Number Publication Date
CN113315198A true CN113315198A (en) 2021-08-27

Family

ID=77375350

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202110581146.XA Pending CN113315198A (en) 2021-05-26 2021-05-26 Can replace lithium battery device that lead acid battery used

Country Status (1)

Country Link
CN (1) CN113315198A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114301107A (en) * 2021-11-15 2022-04-08 厦门海泰新能技术有限公司 Positive and negative level energy storage system and control method thereof

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114301107A (en) * 2021-11-15 2022-04-08 厦门海泰新能技术有限公司 Positive and negative level energy storage system and control method thereof
CN114301107B (en) * 2021-11-15 2024-01-30 厦门海泰新能技术有限公司 Positive and negative level energy storage system and control method thereof

Similar Documents

Publication Publication Date Title
US9136715B2 (en) Rechargeable battery pack and method of charge/discharge equalizing
CN101582517A (en) Charging and discharging battery pack and control method thereof
CN208570836U (en) Under peak load shifting operating condition in communication base station multiple groups battery charge-discharge control system
CN111323716B (en) Device and method for judging reliability of battery capacity and method for improving performance of storage battery
CN114389347B (en) Full current control battery module and full current control battery energy storage system
CN109088461A (en) A kind of electrically independent multichannel variety classes battery pack parallel control device of charge and discharge and method
CN202535104U (en) Battery management system capable of automatically cutting off failure units in series-connected battery pack
CN113315198A (en) Can replace lithium battery device that lead acid battery used
CN211456735U (en) High-voltage lithium battery power control circuit
CN111092471B (en) Using method of overcharge and overdischarge protection circuit for energy storage battery pack
CN216290226U (en) Can replace lithium battery device that lead acid battery used
CN107946528B (en) Battery pack and battery pack system
CN215646321U (en) Formation and capacitance circuit, equipment and system
CN115549264A (en) Battery management system and charge equalization control method
CN213341687U (en) Intelligent power lithium battery circuit for automobile
CN212137299U (en) Parallel high-voltage control box of battery system
CN211239354U (en) Main loop control circuit of energy storage equipment
CN209088559U (en) A kind of multichannel variety classes battery pack parallel control device of tandem tap
CN109787327A (en) A kind of lithium ionic cell module management circuit
CN218124357U (en) Anticreep circuit suitable for lithium electricity BMS divides mouthful circuit
CN216959376U (en) Energy storage BMS high pressure device
CN219351311U (en) Lithium ion battery protection board structure
CN218449574U (en) Battery management system
CN215956077U (en) Lithium battery output buffer circuit
CN218958594U (en) Multi-string lithium battery charge-discharge protection circuit

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination